implement multiplication by scalar

agb/src/display/affine.rs

@@ -193,6 +193,26 @@ impl Mul for AffineMatrix {
     }
 }
 
+impl Mul<Num<i32, 8>> for AffineMatrix {
+    type Output = Self;
+    fn mul(self, rhs: Num<i32, 8>) -> Self::Output {
+        self * AffineMatrix {
+            a: rhs,
+            b: 0.into(),
+            c: 0.into(),
+            d: rhs,
+            x: 0.into(),
+            y: 0.into(),
+        }
+    }
+}
+
+impl MulAssign<Num<i32, 8>> for AffineMatrix {
+    fn mul_assign(&mut self, rhs: Num<i32, 8>) {
+        *self = *self * rhs;
+    }
+}
+
 impl MulAssign for AffineMatrix {
     fn mul_assign(&mut self, rhs: Self) {
         *self = *self * rhs;